Sewing machine



SEWING MACHINE July 8 N240 ERPLER Filed April 14, 1920 s Sheets-Sheat- July 8 192%.

A. -EPPLER SEWING MACHINE Filed April 14, 19 20 3 Sheets-SW61 2 A. EP PLER SEWING MACHINE Filed April 14 3 She s-Sheet r a i I/l/II/IIIIIIIIII s Patented July 8, 192%..

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ERY CORPORATION, OF PATERSON. NEW

JERSEY. A CORPORATION OF NEW JERSEY.

SEWING MACHINE.

Application filed April 14, 1920. Serial No. 373,944.

To a to]? am it may concern- Be it known that 1, ANDREW Errmsn, a citizen of the United States, residing at Lynn. in the county of Essex and State of a Massachusetts. have invented certain new and useful Improvements in Sewing Machines: and I do hereby declare-the following to be a full, clear, and exact description of the invention, such as will e able others skilled in the art to which it appertains to make and use the same;

The present invention relates to sewing machines and more particularly to thread waxing and heating devices for sewing machines.

The principal object of the present invention is to provide a novel and improved heating system for sewing machines which, upon being set into operatiomis capable of rap idly heating the desired parts of the machine and of maintaining the parts at a predetermined unitorm temperature.

With this and other objects in view, the features of the present invention consist in certain constructions, arrangements and combinations of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art.

The several features of the present invention will be clearly understood from the following description and accompanying drawings, in which:

Figure 1 is a side elevation, partly diagrammatical, of portions of a wax thread curved hook needle shoe sewing machine embodying the features in their preferred form; Fi 2 is a rear view, partly in section, of the wax pot and associated parts of the machine; Fig. 3 is a. plan view of the parts of the machine illustrated in Fig. 2; Fig. 4 is a sectional view taken on the line H of Fig. 3; and Fig. 5 is a sectional plan. view taken onthe line 55 of Fig. 2.

The sewing machine illustrated in the drawings is provided with a wax pot 2 having a partition 41: therein for separating the lumps of wax from the melted wax through which the thread passes. The partition 4; comprises a transversely curved plate, the lower end of which is spaced from the bottom of the wax pot by being supported upon shoulders 6 formed on walls of the wax pot, and is removably held in place by theengagement of .its longitudinal edges with grooves formed in opposite walls of the Wax pot. The stretch of thread leading from the, supply is thread eyelet 8 of the usual const uction located near the bottom of the pot. The eyelet 8 is mounted" upon the lower end of a rod 10, the upper end of which rod extends through an aperture in a fixed lug 12. To provide for vertical adjustment of the eyelet 8, the supporting rod 10 is adjustably seoured in the aperture in the lug 12 by means of a set screw 14. The lug 12 is detachably secured to a yoke bar 16 secured to the upper edge of the wax pot by means of a screw 18 extending through a slot in the lug 12 and threaded into an aperture in the bar 16. By

loosening the screw 18'the lug 12 may be readily detached from the bar 16 to permit removal of the eyelet S and its supporting rod from the wax pot, a handle 20 being termed on the lug 12 for this purpose. The eyelet 8 is mounted on the rod 10 in such a manner that when the rod and eyelet are removed from the wax pot, as above described, the

eyelet may be easily detached from the rod for the purpose of cleaning or replacement, I

but when the eyelet is in operative position it is securely held in place. To this end. the lower end of the supporting rod 10 bent to engage substantially one half of a pcripheral groove in the eyelet 8, while the remaining portion of the groove is engaged by a block 22 mounted to slide on the rod 10 and held in place by' a set screw 24 threaded into an aperture in the block and engaging the rod. By loosening the set screw 24 and s id ng the block 22 on the rod away from the eyelet, the eyelet may be removed from the rod. The stretch of thread leading from the eyelet 8 to the thread handling devices of the machine extends through a wax stripping device 26 of the usual construction mounted on the bar 16.

The wax pot 2 is mounted in recess 28 formed in a cover 30 that closes the top of a water reservoir 32 secured by bolts 34 to a bracket projecting from the frame of the machine. The wax pot is spaced from the Wall of the recess 28 to provide an air jacket between the wax pot and the reservoir and the wax pot is held in place by screws 36 extending through apertures in the ends of the bar 16 and threaded into apertures in the flange of the cover 30.

The sewing machine illustrated in the drawings is provided with a circuitous hot guided through the wax pot by a water heating systemthat is supplied with water from the reservoir 32 and extends through the wax pot and to other parts of that the system shall supply the desired heat rate.

to the parts as rapidly as possible'after the system is set in operation and maintain the parts at a. predetermined uniform temperature, the system is provided with a heating device 38 for uniformly heating-the water in a thin fllm as it passes through the sys-. tem, and is further provided with a pumping device 40 for causing the water to flow through the system at the desired The heating device 38 comprises an electric heating element 42 that is in an electric circuit .with a switch 44 and a dynamo or other source of electrical energy 46. The heating element 42 is inserted in a tube 48 that extends through av transverse'cylindrical bore 50 formed in a wall of the water ,reservoir 82. The wall of the bore 50 is grooved between its ends to form an annular heating chamber 52 that encompasses the heating element t2, the tube 48 constituting the inner wall of the chamber.

The heating chamber 52 is" directly connected with the pumping device 40 through a short passage 54 formed in the rear wall of .the reservoir 32. The heating chamber 52 is pro (led with an outlet 56 which is connected by pipes 58 with the end of one leg. of a U-shaped heating passage 60 formed in the forward wall of the wax pot 2 which passage is for the purpose of supplying heat to the wax in the wax pot. The other leg of the passage 60 leads through piping G2 to the other parts of the sewing machine which it is desirable to heat, and then through avertical pipe Get to a passage (36 formed in the bottomwall of the reservoir, which passage leads to the inlet 68 of the pumping device 4:0. In order to supply the. system with water from the reservoir 32, an opening 72 is formed in the rear wall of the reservoir which leads to the passage 66.

It will be apparent from the foregoing that the water in the system does not reenter the reservoir but continues to flow in a circuit to the parts of the machine. Also, due mainly to the small-amo1int of Water in use in the system and to the construction of the heating device,the water is heated rapidly toa certain temperature and maintained at this temperature. For the sake of compactness and simplicity, the heating device, reservoir, and wax pot are constructed to form a unitary structure, but it is. of course, desirable that the wax' pot shall be heated mainly if not solely by the water in circuit and not by heat radiated to the wax pot through the water in the reservoir. The air jacket, hereinbefore described, between the wax pot and reservoir effective- 1y insulates the wax 0t from the reservoir.

The pumping device 40 is driven by a belt and pulley 74 from the power shaft of the sewing machine so that the water is circulated through the system as soon as the power is turned on, even though the machine itself is not thrown into operation. The pumping device comprises a pair of interineshing cog wheels 76 that are mounted 011 arbors T8 journaled in bearings in a bracket projecting from the water reservoir 32. The connection between the cog wheels 76 and the pulley 74 comprises a worm wheel 80 secured toan extension of one of the arbors 78. The worm wheel 80 is operatively engaged by a worm 82 carried by a shaft 84 to which shaft the pulley 74 is secured. r

The device is adapted to be filled with water through a funnel 86 which is connected by a pipe 88 and a hand valve 90 with the vertical pipe 6 1. During the filling of the device, air is permitted to escape from the reservoir through an air vent pipe 92 and hand valve 94, and from the system through air vent valves 96, the valves being closed during the normal operation of the device. A

The nature and scope of the present invention having been indicated'and a machine embodying the several features of the invention in their preferred form having been described, what is claimedis:

1. A sewing machine having, in combination, a frame, a wax pot mounted on the frame, fluid conducting means for conducting fluid in a circuitous path extending through the wax pot and to parts of the frame, a pump for causing the flow of the fluid in the conducting means, a fluid reservoir for initially supplying fluid to the conducting means, a heating device embodied in the conducting means comprising a casing, and a heating element located within the casing and spaced slightly from the inner wall of the casing to cause fluid in the conducting means to flow in a thin film over the heating element.

2. A sewing machine having, in combination, a frame, a fluid reservoir, a wax pot mounted in a recess in the reservoir havin its'walls spaced from the walls of the recess to provide an air, jacket between the wax pot and the reservoir, fluid conducting means exclusive of the reservoir for conducting fluid in a circuitous pass through the wax 0t and to parts of the frame, connections lietween the reservoir and conducting means to supply fluid from the reservoir to the conducting means, and means for heating the fluid in the conducting means.

3. A sewing machine having, in combination, a frame, a wax pot, a heating device comprising a heating elementand a relathe heating element, and fluid conducting means for conducting fluid in a circuitous path-through the wax pot and to parts of the frame comprising said chamber to cause the fluid to pass in a thin film about the heating element.

4. A sewing machine having, in combinaconducting fluid in a circu1tous path through the wax. pot and to the parts of the frame comprising said chamber to cause the fluid to pass in a thin film about the heating element.

5. A sewing machine having, in combination, a frame, a fluid reservoir, a wax pot extendlng into a recess 1n the reservoir and spaced from the walls of the recess to provide an air jacket between the reservoir and the wax pot, a chamber formed in the walls of the reservoir, a heatin element located in the chamber, fluid con ucting means for conducting fluid in a circuitous path outside of the reservoir through the wax pot and to parts of the frame comprising said chamber to cause the fluid to pass in a thin film about the heating element, and connections between the reservoir and the conducting means to supply fluid'to the con ducting means from the reservoir, and a pump embodied in the fluid conducting means to cause the flow of the fluid therein.

- ANDREW'E-PPLER. 

